I think it's pretty safe to say none of that is true. Notice how she ups the severity of the abuse and the marks it left. She also increases the amount of people that know about the abuse from just Matt M. to her sister and a few other people.
She really thinks people are stupid. She thinks if she puts it out there we'll think it's the truth. Common sense tells you that if these things existed they would have been used. If Angela really did see the bruises she would have been put on the stand, assuming she has no credibility issues, as Matt does.
Also, re: discovery violation, again, she thinks if she says this people will just assume it to be true. Common sense says if Juan had violated discovery and with held info the attorneys would have gotten a re-trial with the new evidence. Common sense says Juan didn't withhold anything because they were still able to use damning texts against him. I don't think she actually knows what a discovery violation is. Motioning and having the motion granted to have certain texts and emails withheld is not a discovery violation. Discovery violation is when the state has info that could help the defense and doesn't turn it over. It's apparent Juan did not do that and would not do that. He's not stupid.